/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/Online/OnlineServicesEngineUtils.h
Gets anFNamethat uniquely identifies an instance of a world to differentiate online services for PIE
anFNamethat can be used with online services
[FName](API\Runtime\Core\UObject\FName) GetOnlineIdentifier ( const [FWorldContext](API\Runtime\Engine\Engine\FWorldContext) & WorldContext ) const